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Specimen Atlas of Research Peptides81 plates · MIT
Side-by-side · Research reference

CagrilintidevsPT-141

Side-by-side comparison across mechanism, dosage, evidence, side effects, administration, and stack synergies. Citations on every claim where available.

APhase 3HUMAN-REVIEWED35/64 cited
BFDA-ApprovedHUMAN-REVIEWED13/41 cited
Cagrilintide
Long-Acting Amylin Analogue · Phase 3
7.5%Additional weight loss vs semaglutideAhmed 2026
Once weeklyDosing frequencyBailey 2026
Dual AMYR/CTRReceptor agonismBailey 2026
SQ · Once WeeklyBailey 2026
PT-141
MC4R Agonist · FDA-Approved (HSDD)
SQ · Abdomen / thigh · ≥45 min before sex

01Mechanism of Action

Parameter
Cagrilintide
PT-141
Primary target
Amylin receptor (AMYR) and calcitonin receptor (CTR) heterodimeric complexesBailey 2026
Melanocortin-4 receptor (MC4R) in hypothalamusSimerly 2023VYLEESI (bremelanotide injecti 2019
Pathway
AMYR/CTR agonism → Central satiety signaling → Reduced food intake, delayed gastric emptying, suppressed glucagonBailey 2026
MC4R agonism in paraventricular nucleus → autonomic + neuroendocrine sexual arousal pathwaysSimerly 2023
Downstream effect
Central satiety induction, prandial glucagon suppression, reduced caloric intake, weight loss, improved glycemic controlBailey 2026Yamauchi 2026
Increased sexual desire and arousal; central rather than peripheral mechanismClayton 2015
Feedback intact?
Yes — acts via physiological amylin pathways
Origin
Second-generation non-aggregating long-acting amylin analogue designed for once-weekly dosingBailey 2026
Cyclic 7-AA peptide derived from α-MSH (agonist Ac-Nle-Asp-His-D-Phe-Arg-Trp-Lys-OH cyclic)VYLEESI (bremelanotide injecti 2019
Antibody development

02Dosage Protocols

Parameter
Cagrilintide
PT-141
Standard dose (combination)
Cagrilintide 2.4 mg + Semaglutide 2.4 mg (CagriSema)Yamauchi 2026
Phase 3 REDEFINE 5 trial dosing.
Monotherapy dosing
Dose-dependent, under investigation
Monotherapy trials reported in meta-analysis.
Frequency
Once weekly (subcutaneous)Bailey 2026
Long-acting formulation.
PRN, max 8 doses / month
Evidence basis
Phase 3 RCT (REDEFINE 5), meta-analysis of 3 RCTs (n=3545)Yamauchi 2026Ahmed 2026
FDA-approved (HSDD pre-menopausal women)VYLEESI (bremelanotide injecti 2019Clayton 2015
Duration
26–52 weeks in trialsYamauchi 2026
PRN; reassess if no benefit after 8 doses
Route
Subcutaneous injectionBailey 2026
Standard dose
1.75 mg SQVYLEESI (bremelanotide injecti 2019
Single dose ≥45 min before anticipated sexual activity. Max 1 dose / 24 hr.
Lower / starter dose
1 mg (off-label)
Reconstitution
Pre-filled commercial pen (Vyleesi). Research vial: bacteriostatic water.
Timing
≥45 min before sexual activity

03Metabolic / Fat Loss Evidence

Parameter
Cagrilintide
PT-141
Weight loss vs semaglutide
7.47% greater percentage weight lossAhmed 2026
CagriSema combination vs semaglutide monotherapy (meta-analysis).
Absolute weight change
Significantly greater absolute weight reductionAhmed 2026
Mean difference favoring combination therapy.
Mechanism
Central satiety inductionBailey 2026
BMI reduction
Significant BMI reduction vs comparatorAhmed 2026
Glycemic benefit
Reduced fasting glucose and HbA1cAhmed 2026
Synergistic effect with semaglutide in combination.
Lipid effects
Improvements in total cholesterol, LDL-C, HDL-C, VLDL-C, triglyceridesAhmed 2026
Body composition
Predominant fat loss with weight reduction
Mitochondrial function
In vitro effects on skeletal muscle mitochondria under metabolic stress conditionsOld 2026
C2C12 myotube study; clinical relevance under investigation.
Combination rationale
Multi-pathway approach: amylin (satiety) + GLP-1 (incretin)Lempesis 2026
Key publications
REDEFINE 5 (Yamauchi 2026) · Ahmed meta-analysis 2026 · Bailey review 2026Yamauchi 2026Ahmed 2026Bailey 2026

04Side Effects & Safety

Parameter
Cagrilintide
PT-141
Gastrointestinal
Nausea, diarrhea (common with incretin-based therapies)Pardali 2026
Dietary management and nutritional monitoring recommended.
Injection site reactions
Local reactions possible with subcutaneous administration
Safety profile
Generally consistent with incretin-based therapies
Phase 3 and meta-analysis safety data.
Tolerability
Tolerability considerations similar to GLP-1RAs
Muscle preservation
Lean mass considerations during weight loss
In vitro mitochondrial effects observed; clinical impact under investigation.
Nausea
Common (~40%); often transientVYLEESI (bremelanotide injecti 2019
Flushing
Common, transient
Injection site reaction
Erythema, mild pain
Headache
Common
Hyperpigmentation (focal)
Rare focal skin darkening; reversible after discontinuationVYLEESI (bremelanotide injecti 2019
Hypertension (transient)
Mean ↑6 mmHg systolic peaking ~4 h post-dose; resolves within 12 hVYLEESI (bremelanotide injecti 2019
Pregnancy / OB
Contraindicated
Cardiovascular disease
Use caution; transient BP rise
Absolute Contraindications
Cagrilintide
  • ·Hypersensitivity to cagrilintide or formulation components
PT-141
  • ·Uncontrolled hypertension
  • ·Known cardiovascular disease (caution)
  • ·Pregnancy
Relative Contraindications
Cagrilintide
  • ·Severe gastrointestinal disease
  • ·History of pancreatitis (incretin-based therapy consideration)
PT-141
  • ·Pre-existing hyperpigmentation disorders
  • ·MC4R-pathway-dependent psychiatric conditions

05Administration Protocol

Parameter
Cagrilintide
PT-141
1. Dosing frequency
Once-weekly subcutaneous injection. Long-acting formulation designed for weekly administration schedule.Bailey 2026
Vyleesi: pre-filled auto-injector. Research vial: 2 mL bacteriostatic water per 10 mg → 5 mg/mL.
2. Combination form
Co-formulated with semaglutide as CagriSema for single weekly injection combining amylin and GLP-1 receptor agonism.Yamauchi 2026Bailey 2026
SQ — abdomen or thigh.
3. Injection site
Subcutaneous — typically abdomen, thigh, or upper arm. Rotate injection sites weekly to minimize local reactions.
≥45 min before sexual activity for peak effect. Effect persists ~6–8 h.
4. Storage
Refrigerate 2–8°C. Follow product-specific storage instructions for pre-filled pens or vials. Protect from light.
Vyleesi: room temp ≤30 °C. Research vial: refrigerate after reconstitution.
5. Dietary considerations
Nutritional monitoring recommended during treatment. Dietary management strategies important for tolerability and outcomes.Pardali 2026
Auto-injector (Vyleesi) or 29–31G, 4–8 mm insulin syringe.

06Stack Synergy

Cagrilintide
+ Semaglutide
Strong
View Semaglutide

Cagrilintide (amylin receptor agonist) and semaglutide (GLP-1 receptor agonist) act on distinct receptor systems to produce synergistic weight loss through complementary mechanisms — central satiety via amylin pathways plus incretin-mediated glucose control and appetite suppression via GLP-1. Co-formulated as CagriSema, this combination demonstrates 7.5% greater weight loss versus semaglutide monotherapy in Phase 3 trials with additional benefits on glycemic control and lipid parameters.

CagriSema
Cagrilintide 2.4 mg + Semaglutide 2.4 mg
Frequency
Once weekly subcutaneous
Duration
26–52 weeks (trial data)
Primary benefit
Enhanced weight loss, improved glycemic control, multi-pathway metabolic modulation
PT-141
— no documented stacks